Pumping apparatus



Patented Sept. l, 1925.

UNITED SATATES'Y'PY A'r-ENT OFF-ICE- RALPH L. LEE, or DAYTON, OHIO,AssIGNOR To nELco-LIGHT COMPANY, OP DAYTON,

OHIO, A CORPORATION or DELAWARE.

PUMPING APPARATUS.

Application filed August 3, 1923. Serial' No. 655,470.

Among the objects of the present invention is to operate the.reciprocating member 'or piston of a pump in a simple and effectivemanner. Y

Inv order to attain this aim Vof the invention, the embodiment shownherein provides a reversible velectric motor connected by means ofsuitable gearing with ainut vcooperating with a screw threaded shaftconnected with the pump piston. Endwise movement of the nut isrestrained so that revolution of the nut in opposite directions willeffect axial movement of the screw threaded shaft in oppositedirections. The screw threaded shaft is prevented from rotating by meansof a spline and key connection with a stationary part. Means areprovidedl for reversing the electric motor, said means being controlledby the movement ofthe screw threaded shaft.

Other and further objects of the present invention will be appa-rentfrom the following description, reference being had to the accompanyingdrawings wherein a preferred embodiment of one form of the presentinvention is clearly shown.

In thedrawings:

The figure of the drawings discloses diaof the worm gear 35 isinternally threadedV and functions as a nut cooperating with a lscrewthreaded shaft 42. An unthreaded orammatically pumping apparatusinclud-` end 43 of the shaft 42 extends into the pump cylinder 23 andfunctioning as a piston rod is connected with piston 24. The oppositeend of. shaft 42 is, provided with a reduced :unthreaded portion 44,forming a shoulder 4 5. A stop member 46 is securedito said portion 44adjacentits outer end. Rotation Vof shaft `42 is prevented by key47cooperating with a groove 48 in shaft 42.

A reversing switch 50 comprises a switch arm 5l, provided with contacts52 and 53 and pivotedV at 54..l A coil spring vis attached to a lever56, .pivoted at 57, by a pin 58 and to switch arm 51 by a pin 59. kStops6() and 61, spaced equally distant from the pivotpoint 57 limitthe throwof lever 56. Contacts 52 and 53 cooperate with' contacts 62 and 63,respectively, which are connected with the motor elds 31 and 32,respectively, by wires l64 and` 65,V respectively. Fields 31 and 32 arewound so as toproduce opposite magnetic effects withrespect to the motorarmature to cause it to rotate Vin opposite Vdirections as the fieldsare successively and alternately connected with a current source. Theopposite ends of these fields 31 and 32 are connected with 'motorbruslr68 by wires 66 and 67, respectively. Motor brush 69 and switcharm' 51 are yconnected with a suitable source of electrical currentthrough c wires 70 and 71, respectively.

' Mode of operation.

Assumingthat the circuit connections are in the position shown in thedrawings, the

'30 will rotate the shaft 33, causing the worm .f

34 to drive theV worm gear 35 and the hub y'38, to move the screw shaft42 endwise to the right, asviewed iin the drawings, thus moving thepistonr 24 in the same direction, drawing fluid into the pump 20 throughinlet 21 and forcing it out through outlet 22, in the usual manner. Asthe shaft 42 moves to the right, the shoulder 45 will come in con-tactwith the lever 56, shifting it on its ...pivot 57. As soon as the lever56 passes its lili) dead center, the spring 55 will snap the v switcharm 51 over, through its pivotal'conquickly broken and contacts 62 and52 to be quickly brought together, thus exciting the nection 54, causingcontacts 63 and 53 to be`v field 3l .and causing the motorBO to, rotatein the opposite direction. The circuit connections` willthen includewire 7l, switch arm 51, contact 52, Contact 62, `wire 64, field 3l, wire66, wire 67, brush 68, motor armature, brush 69, and wires 70 and 71being connected with a current source.

When the directionof rotation ofthe motor is reversed, the shaft 33 willbe ro- ,tated in the Areverse directiom thus causing worm 3,4 to rota-tethe worm gear 35 in a 'reverse direction thereby moving the screw shaft42 and piston 241endwise to theI left as viewed in the drawing. As theshaft 42 moves to the left, the vstop 46 will come in Icentact with thelever 56, shifting it `on its pivot 57., Assoon as; the lever passes itsdead center, the-'spring 5,5 will snap the switcharmlover., through itspivotal connection 54,1 causing contacts 52 and 62 to bevquicklybroken-andcontacts.63,.and 53 to be quickly brought togethertoproduce arepetition of lthevv cycle `of operations heretofore :describedY 'f Y y Onefadvantage of the present .invention is theapplication offtheffull vpower of the .primemover substantially at the beginning of.eachstroke of. theifpiston and the continuance of that application voffull power Luntill substantially the :end of the stroke. 4This is aneffect which cannot 1 Lbe produced by the=usualcrank operatedspiston.v YAnother advantage vis that the space requirements are; less thanrequiredfor crank mechanism especial-ly when'thestroke of the piston is.relativelygreat Y While the yform of mechanism'. herein shownandndescribed constitutes a preferred v'embodimentof one form vofinvention, it is to be understood -tlliatfother forms might be adoptedand various changes and alterations made in the shape, size, andproportion of Vthe'elementstherein'without. departing from ment of SaidScrew Shaft, @gerend-035th@v the? spirit Aand scope of` the invention.

yWhat is claimed isfasffollows: 4Pumping apparatus comprising, incombination,.a pump including a piston and la-'piston rod providedwitha' screw-threaded port-ion; ar nuti for-operating vsaidpistonrod anelectric motor for driving the nut and vincluding separate motorreversing fields; a'switeh for-rendering' either of the fieldsoperative; and, connections between lsaid switch and piston rod wherebysaid field may be successively and alternately rendered operativeautomatical `2. Pumping apparatus comprising, in

ly to reverse themotor.

combination, a pump including a reciproeating piston; an electric motorhaving separate motor rreversing fields and an armature shaft with aworm cut thereon; a worm gear cooperating with said worm and providedwith an internally threaded hub; a lscrew shaft extending through saidhub and vccf'operating therewith but held against rotary movement, oneend of the screw shaft lconnecting with said piston; a switchl forrendering either of the fields operative; and

provisions carried by saidscrew shaft whereby said fields may be natelyrendered oper reverse the motor.

3. isumpingapparatus g comprising, in combination, fa pump includingafreciprocat- `ing piston and, a' piston rod provided with a screwthreaded portion; a nut cooperating with the threaded portion forAreciprocating successively and alterative .automatically toY saidpiston rod; an electric. motor for drivcombination, a pump including areciprocat- `ing piston.; anelectric-motor vhaving separate :meterreversing fields and anyarmature shaft witha worm cut thereon; a wormgear cooper-ating with said 'worm vand provided with an internallythreaded hub; a screw shaft Y,extending .through saidhub and cooperatingtherewithfto effect endwise movescrew shaft connecting withf'saidpiston; a switch for rendering ,either of the fields operative;andwprovisions carried by,y said screw shaft whereby said fields may besuccessively and alternately rendered operative automatically toreverse'the motor.

In testimony whereof I hereto afiiX my signature.

